Following news that Twitter’s user base grew just 2 percent in the last 6 months of 2013, new data from Shareaholic has revealed that Twitter accounted for just over 1 percent of social media referral traffic in Q4 of last year, a decline of 4.31 percent (0.05 percentage points) overall from September.

Facebook, meanwhile, drove more than twice the referral traffic of the seven other top social media sites combined, with a 15.44 percent December share, up from 10.37 percent in September.

Pinterest is also on the rise, accounting for 4.79 percent of referral traffic in December, growing more than 30 percent since September. Stumbleupon and Google+ also had solid innings in Q4 (albeit relatively to the wooden spoon position in Google+’s case), while Reddit, LinkedIn and YouTube saw pretty alarming declines.

I think there are two stories developing here that are amounting to the same thing: Twitter’s stagnation in the face of Pinterest’s advance. Be interesting to see if this continues through Q1 2014. In the meantime, however, Twitter holds third place overall in social referrals, although StumbleUpon is closing fast, with LinkedIn and Google+ having almost no share.